13581157 has 4 divisors (see below), whose sum is σ = 13616460. Its totient is φ = 13545856.

The previous prime is 13581149. The next prime is 13581173. The reversal of 13581157 is 75118531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4813636 + 8767521 = 2194^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 13581157 - 2³ = 13581149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17068 + ... + 17845.

It is an arithmetic number, because the mean of its divisors is an integer number (3404115).

Almost surely, 2^13581157 is an apocalyptic number.

It is an amenable number.

13581157 is a deficient number, since it is larger than the sum of its proper divisors (35303).

13581157 is an equidigital number, since it uses as much as digits as its factorization.

13581157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35302.

The product of its digits is 4200, while the sum is 31.

The square root of 13581157 is about 3685.2621345028. The cubic root of 13581157 is about 238.5863481993.

Adding to 13581157 its reverse (75118531), we get a palindrome (88699688).

The spelling of 13581157 in words is "thirteen million, five hundred eighty-one thousand, one hundred fifty-seven".